SCJP 1.6版考題 028

1. class X{
2.   X(){System.out.print(1);}
3.   X(int x){
4.     this();
5.     System.out.print(2);
6.   }
7. }
8. public class Y extends X{
9.   Y(){
10.     super(6);
11.     System.out.print(3);
12.   }
13. Y(int y){
14.   this();
15.   System.out.prin tln(4);
16. }
17. public static void main(String[] a){new Y(5);}
18.}


What is the result?

  A. 13
  B. 134
  C. 1234
  D. 2134
  E. 2143
  F. 4321

解答

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Ans: C

解說: 此題follow本身建構子呼叫this()與父類別建構子呼叫super()的過程，即可跑出答案。